/Engine/Plugins/Runtime/ReplicationGraph/Source/Public/ReplicationGraphTypes.h
Currently we are using raw AActor* for our replication lists. We may want to change this one day to be an ID or something else that can index fast into arrays etc. (Currently we are using TMaps for associative data, static arrays would be faster but introduce constraints and headaches) So for now, using a typedef and some helper functions to call out the interface/usage of FActorRepListType.
typedef [AActor](API\Runtime\Engine\GameFramework\AActor) * FActorRepListType